Total time spent: 50h

Day 1 (June 9th): Familiarize yourself with fusion 360

Today I created an education account for fusion 360 and installed the application as well. In addition to that, I familiarized myself with the program by building a lego brick from an tuturial.

Time spent: 3h

Day 2 (June 12th): First steps in KiCad

Today I installed KiCad and followed the tutorial from Hackpad. I also decided for the ESP32-32D, added the three-pin connector for the servo and I was looking for a screen. However I am still unsure about the measurements of the footprint. Time spent: 3h

Day 3 (June 26th): A lot of porgress for the PCB

On day three, I worked a lot. Firstly, I spent some time searching for a good way to implement audio. Then I realised that I didn't need a fancy audio source with an amplifier. I opted for a simple active buzzer. Next, I looked for some buttons and ended up with Hackpad-like keyboard switches to control the box later on. I also did a lot of research on load cells. I will use an HX711 chip for the load cell. Tomorrow, I need to find the exact measurements of the cell for the box. I also created a schematic diagram and moved some parts to the back of the PCB. Tomorrow, I have to wire the PCB and perhaps create the BOM on GitHub. Overall, I am really happy with today's progress.

The wired schema:

The current PCB-state:

front: back: Time spent: 8h

Day 4 (July 1st): Finished PCB (hopefully)

I was really busy today. I added a fourth switch and wired the PCB. I also started the 3D modelling of the box and went to a local building centre to look at the prices of screws. I am also quite confident with my selected parts. A boom will follow shortly.

Time spent: 12h

Day 5 (July 2nd): PCB-Housing

On day 5, I mainly worked on the PCB housing for the box. I created screw holders and a front plate for installation, as well as cut-outs for components and the hall effect sensor. Front-Cover: Cut-Outs: with PCB: Time spent: 4h

Day 6 (July 3nd): Closing-Mechanism

Today I started creating the closing mechanism. First I added the housing for the servo motor. servo motor housing: Afterwards I started creating the gear system. gear system: Time spent: 2h

Day 7 (July 5nd): Closing-Mechanism

Today I made a lot of progress. I added motion to the gear and a gear cover to hold the servo. Afterwards I created the distance holder for the load cell as well as a model of the laod cell and the inner box that carries the weight. Time spent: 8h

Day 8 (July 6nd): Closing-Mechanism

Today I added a Box cover with some hinges. Then I added the final part to close the box. Afterwards I made the hole for the wireless charger. I also had to add a lot of details with regard to spacing, which was really time-consuming. Time spent: 10h